Lost backpack on P4

[lexej]

I'm hoping someone might be able to help. Yesterday, I boarded a P4 at Casino avenue together with my two year old daughter around 12:45 and took it to the Horniman. I left my backpack underneath the seat next to the exit doors when I offered my seat to someone shortly before getting off. The backpack is medium sized, grey/black, and has a few buttons/pins on the top. It contained a copy of the children's, book 'Barbara throws a wobbler' and, most importantly, a 2012 Macbook pro in a black sleeve.

Nothing has ended up at Catford bus garage, but I'm posting here in the hope that someone might have found it. The laptop is old and not worth much, but I can't afford to replace it. It does also have a fair amount of family photos on it. I can offer a finders fee of 100 pounds.